Job invitation

I've got the job invitation e-mail. This message is below:

Dear charade-san,

　
I'm with *****, a global search firm. I tried contacting you earlier to discuss about a couple of exciting opportunities with one of our clients, a leading developer of software for technical computing and model-based design. We are helping them identify Sales Managers and Application Engineering Managers who will be leading the operations in the mission critical Japanese market.

　
Would you have any interest in exploring this opportunity for yourself? If so, let me know a convenient time and number to contact you personally. Attached please find the job descriptions for your review. Also your help in networking with top talented people in the industry would be greatly appreciated.

　
I look forward to hearing from you.

　
Thank you,

How timely! In fact, I've had a lot of interest in this job. But I'm wondering why he knows my name. So my reply is:

Thank you for your invitation.
Yes, these may be exciting opportunities. Let me check and see them.
　
By the way, how did you get to know my name?
　
Regards,

Just then he called me. But I pretended not to be in. I don't want to talk to him before he explains the reason.